<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let arr = [5, 6, 20, 7, 10, 15, 100]
        // let arr=[2,4,6,8,10]
        let num = 0
        let conut = 0

        function odd(a) {
            for (let i = 0; i < a.length; i++) {
                if (a[i] % 2 !== 0) {
                    num += a[i]
                    conut++
                }
            }
            if (conut !== 0) {
                return num / conut
            }else{
                return 0
            }
        }
        let num1 = odd(arr)
        console.log(num1);
    </script>
</body>

</html>